A deviant sexual act in which a man achieves all men's dream of a threesome except the man has to settle for blood relatives as the two other partners. The combination of relatives is not relevant, but the key is they must be blood realatives for the Gaston Manja Twa to have ocurred.

Dalton had been having a hard time losing his virginity before his family threw him a 35 birthday party. After a few keg stands and shots of Mad Dog 20/20 his 63 year old Great Aunt from Florida decided to deflower him and the same time that Cousin Jimmy from East Georgia wanted to tap him. What occured next was a Gaston Manja Twa that will live on at family Christmas dinners for years beacuse while Dalton was having his threesome the rest of the family commenced to Gaston Red Robin Tournament time.